<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div:before{
				width: 200px;
				height: 20px;
				border: 1px solid red;
				content: "ss";
				color: red;
			}
			div{
				-moz-user-select: none;
				-ms-user-select: none;
				
			}
		</style>
	</head>
	<body>
		<div>我好帅啊</div>
	</body>
</html>
